伊拉克HF油田Mishrif组厚壳蛤滩相储层沉积与早期成岩特征

发布时间：2018-05-19 19:51

本文选题：HF油田 + 白垩系　；参考：《中国石油大学学报(自然科学版)》2016年05期

【摘要】：通过岩心观察、薄片鉴定、同位素和微量元素分析,研究伊拉克HF油田Mishrif组富厚壳蛤层MB2-MC1层的沉积微相和早期成岩特征。结果表明,Mishrif组MB2-MC1层发育在开阔台地-台地边缘相。富厚壳蛤层中发育2期厚壳蛤滩以及2套含厚壳蛤风暴层。厚壳蛤滩沉积在台地边缘,Sr/Ba比值为5.74,高于2套开阔台地沉积的风暴层。厚壳蛤滩的发育特征有别于厚壳蛤礁,无原地生长特点,同沉积破碎严重,以厚壳蛤砾屑灰岩、厚壳蛤颗粒灰岩和泥粒灰岩为主要岩相,与开阔台地潮下浅滩交互沉积。同生期厚壳蛤滩相的暴露导致早期大气淡水淋滤作用较强,而胶结作用较弱,形成以粒间孔、粒间溶孔、溶洞、溶缝为主的储集空间。
[Abstract]:The sedimentary microfacies and early diagenetic characteristics of the MB2-MC1 layer of the Mishrif formation in HF oilfield in Iraq were studied by means of core observation, thin slice identification, isotopic and trace element analysis. The results showed that the MB2-MC1 layer of Mishrif formation developed in the open platform-platform margin facies. In the thick shell clam layer, the second stage thick shell clam beach and 2 sets of thick shell clam storm layers are developed. The Sr / Ba ratio of thick clam flat deposited on the edge of platform is 5.74, which is higher than that of two sets of storm beds deposited on open platform. The development characteristics of thick shell clam beach are different from that of thick shell clam reef and have no in situ growth characteristics. The codeposition is very serious. The main lithofacies is clam gravelly limestone, clam pellet limestone and mud grained limestone, which are interactively deposited with shallow shoal under open platform tide. The exposure of cogeneration thick clam beach resulted in strong leaching of early atmospheric fresh water and weak cementation, resulting in a reservoir space dominated by intergranular pores, intergranular dissolved pores, cavities and dissolving joints.
【作者单位】：成都理工大学油气藏地质及开发工程国家重点实验室;成都理工大学能源学院;中国石油勘探开发研究院;
【基金】：中国石油股份有限公司“十二五”重大专项(2011E-2501)
【分类号】：P618.13

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